ariston microgenus he 32

[mfgs]

I have got to look at a ariston microgenus 32he tomorrow with an intermittent e34 fault, I think the customer said. I looked it up and it says air pressure switch problem, was wondering if there are any common problems with these and I have only ever seen about two of them before.

 

[hydrotherm]

Done these before where the restrictor ring in the flue throws up e34. Take it out and throw it away.

 

[R1CKY]

Had a few of these that have indicated APS problems and has turned out to be the fan!

 

[JJ The Plumber]

Check hose from fan to aps, might have water blocking it inside and aps won't make. Had this a few times.

 

[Billy Bob Bob]

it will either be dirt in the fan venturie,water in the hose,the ring in the secondary condensing hex(in the flue spigot on early models) or just for a change the aps but you can verify 3 of these without parts

 

[Rizme]

its the restrictor ring between the fan and the flue , take that out, and it will take care of E34. I had a similar problem, tried changing the aps didn't work, did some more googling and found out its the restrictor ring.

 

[mfgs]

Spoke to ariston who said most of the time the fan is at fault. Said resistance needs to be between 40-45 ohms across the windings and differential pressure at test point above APS on top of boiler no less than -0.6mb. I got 24ohms resistance and -0.55mb differential pressure so ordered up a fan, got to fit it next week. Checked the tube to the APS and all ok, flue clear etc. Lets hope the fan cures it. Apparently the heat in the boiler affects the fan and makes it run slow and the APS drops out, normally happens when hot water has been run for quite a while which the customer confirmed as it only looks out when running a bath or in the shower.

 

[JJ The Plumber]

Was it the fan? Got to look at one on Friday

 

[mfgs]

Yeah fitted a new fan and I haven't had a call back to say its locked out since